Softwashing pebbledash? Advice needed please

[Clisty1989]

Been asked to quote a house with pebbledash that's covered in black dirt and algae. I've only ever softwashing painted walls and I'm a little worried about bits coming off. Has anyone done  this type of surface before, and if so did you do anything differently, and how did it come up? Haven't quoted it yet as I said I'd have to work out the costs. Thinking soft brush and 2.5% hypo mix, take my time and be careful. Any advice would be more than welcome. I didn't take any photos there, but my mates house is the same dashing so I'll pop there later to take a pic. Thanks in advance

 

[Pjj]

Yes I did my own house it was just dirty with a bit or red algy I sprayed the whole house down with the garden hose ,then just sprayed the walls with hypo mix I gave it several applications allowing around 30 muinits between coats then just rinsed it down with the garden hose made a huge difference, oviously you cannot adjetate it like you would with a painted render or k rend but compared to the neibours houses it looks amazing well worth doing , evan doing it this way a very small amount of the pebble dash will come off but nothing to worry about 

 

[Clisty1989]

Yes I did my own house it was just dirty with a bit or red algy I sprayed the whole house down with the garden hose ,then just sprayed the walls with hypo mix I gave it several applications allowing around 30 muinits between coats then just rinsed it down with the garden hose made a huge difference, oviously you cannot adjetate it like you would with a painted render or k rend but compared to the neibours houses it looks amazing well worth doing , evan doing it this way a very small amount of the pebble dash will come off but nothing to worry about 

Cheers mate this is like the stuff to clean

 

[Pjj]

View attachment 14310

Cheers mate this is like the stuff to clean

Very similar to mine but it’s grey granit